Resin composition, filler-containing resin film for non-aqueous electrolyte secondary battery, and method for producing filler-containing resin film for non-aqueous electrolyte secondary battery

A method for producing a filler-containing resin film for a non-aqueous electrolyte secondary battery, the method comprising:

• applying a resin composition on a substrate, the resin composition comprising:
• a vinylidene fluoride copolymer obtained by copolymerizing vinylidene fluoride and a compound represented by formula (2),
• an insulating inorganic filler, and
• an organic solvent;
• and
• drying the resin composition:
• wherein R1, R2, and R3 are each independently hydrogen atoms, chlorine atoms, or alkyl groups having from 1 to 5 carbons;
• and
• X″′ is an atomic group having a molecular weight of 456 or less and having a main chain having from 1 to 18 atoms,
• wherein the average particle size of the insulating inorganic filler is from 5 nm to 2 μm,
• wherein the filler-containing resin film comprises from 90 to 99.5 parts by mass of the insulating inorganic filler, per 100 parts by mass of the resin film, and
• wherein in the filler-containing resin film, the insulating inorganic filler adheres to the vinylidene fluoride copolymer such that shedding of the inorganic filler from the resin film is suppressed.